.activity-introduce{
  background: #ececea;

  section{
    background: #fff;
  }
  img{
    display: block;
    margin:0 auto;
    width:100%;
  }
  .content{
    margin-bottom:20px;
    box-shadow: 0 5px 5px #d9d9d9;
  }
  .btn-top-share{
    position: absolute;
    right:20px;
    top:20px;
    color: #ffe380;
    display: inline-block;
    font-weight: bold;
    font-size:14px;
    padding:3px 5px;
    border:1px solid  #ffe380;
    border-radius: 3px;
    background: #259cc7;
  }
}